Specialist in Fine Colombian Emeraldssubjetively determines as the approx. % of light returned to the observer as result of internal reflections.Window: The approx. % of light that leaks through the bottom or sides of the stone.Extintion: The approx. % of dark areas in the stone.Every Colombian Emerald is tailor cut to its individual needs. Evaluation is subjective and requires years of experience, continuos viewing and comparison.

Are flaws and or foreign material inside Emeralds crystalline structure.Specialist in Fine Colombian Emeraldssubjectively estimates the quantity of inclusions, as :

(*) Free of Inclusions.

(*) Lightly Included 1 to 3.

(*) Moderately Included 1 to 3.

( ) Highly Included 1 to 3

(*) Asterisk denotes desirability.

Types of Inclusions:
Three Phase inclusions consist of a gas, liquid and a crystal enclosed inside the stone.
Pirite, Calcite, Quartz, Parisite, Albite, Dolomite, Shale are also found and are conclusive evidence of natural origin.Every Inclusion in Colombian Emeralds are unique, their quantification is subjective and requires years of experience, continuos viewing and comparison.